Question

Show me how to solve this problem
Multiply in the indicated base
12[sub]5[/sub]x 4[sub]5[/sub]

Answer 1

Let's change the base to 10 and multiply the numbers in usual way:
12₅ = 5*1 + 2 = 7
4₅ = 4
7x₄ = 28.
28₁₀ = 5*5 + 3 = 53₅
Answer: 53₅.